Ridge vents for corrugated metal roof...

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Author Message rustyb (Unregistered Guest) Unregistered guest Posted on Wednesday, December 17, 2003 - 10:30 pm:    I'm installing a galv corrugated metal roof on my work studio and am having difficulty finding a ridge vent. I know of at least several companies that make ridge vents for standing seam and similar roofs but I have yet to see anything for the old fashion corrugated stuff. I would prefereably like to have one with external weather baffles such as what Air Vents by Certainteed have. Of the data I have looked at, these seem to create the least amount of preasure near the top offering the best air flow under a variety of conditions. I called Air Vent direct hoping to gain info on whether or not one of their vents could be adapted to corrugated roofing & my particular application (due to my ridge beam, the total opening between opposing sides of sheathing is 4.25"). To make a long story short, I could not get anyone on the phone that knew anymore than what they could read in the technical manual which I have. I asked if I could speak to some one there who have handled these or perhaps the designer but to no avail. Does anyone know if there is a ridge vent adaptable to corrugated metal roofing or if one of the Air Vent filtervents will work? Surely someone makes a decent vent that can be made to work with this style of roof. I have looked at Cor-A-Vent but they use an internal baffle. With that said, I'm not opposed to using one if they had one that would work. It seems as though I have few options. If you'd prefer to email me direct, my address is rustyb@northrim.net Your help would be apprecitated. Thanks, r John Bunzick, CCS, CCCA Senior Member Username: bunzick Post Number: 168 Registered: 03-2002 Posted on Thursday, December 18, 2003 - 08:38 am:    I would investigate the companies that make components for the pre-engineered metal building industry (Division 13). The products you were looking at are designed for asphalt shingles, and so would not work very well. Another alternative is to have one fabricated by a capable sheetmetal craftsman, following the basic guidelines of the SMACNA Architectural Sheet Metal Manual. Finally, the corrugated sheet metal manufacturer may have suggestions, and also may have fabricated components allowing a transition from corrugated to flat, or closure sections for the open portions of the corrugations. This would make a custom detail easier to accomplish. There are also companies that make foam inserts to fit between the corrugations, but they'd probably have to be protected from the weather. rustyb (Unregistered Guest) Unregistered guest Posted on Thursday, December 18, 2003 - 11:00 am:    John, I appreciate your post & info. I have spent countless hours on the net searching the metal building industry as you suggested. Much to my amazment, I could find nothing for my application. It seems as though the metal industry has all but forgotten those who want to use the old fashioned style roofing in more modern ways. Anyhow, the products I was looking at do have vents designed for both shingle and metal roofs. But, I can't find any one within that company who is knowledgable enough to tell me if their products will work with the older style roofing. And I can't look for myself as no one within 100 miles of me stocks any thing like this. I have also checked with the manufacturer as you suggested to no avail either. I seem to be hitting a dead end every direction I turn here. However, with that said, I did have an idea last night after posting which is similar to yours of transitioning corrugated to flat. There is a ridge cap that does just that....well kinda. It transitions corrugated to a flat area that curves up and over the other side of the ridge...if that makes sense. I believe I may be able to cut the cap down the middle (which would have been the original peak of the ridge) so it was in two pieces then flatten out the curved area. Each of these pieces would attach to each side of the air opening on my ridge. I may then be able to purchase an off-the-shelf metal ridge vent and attach over this. If you or anyone else has any addtional ideas, I'd appreciate hearing them. Thanks again. rusty Curt Norton, CSI, CCS Senior Member Username: curtn Post Number: 32 Registered: 06-2002 Posted on Thursday, December 18, 2003 - 11:37 am:    Rusty, Have you considered a "hot" roof design that doesn't need the ventilation? rustyb (Unregistered Guest) Unregistered guest Posted on Thursday, December 18, 2003 - 12:32 pm:    Curt, No I haven't really. I designed and built this building with a standard roof system in mind....mostly due to the salvaged/recycled materials I had on hand. I must admit however, even though architectural design was my profession, I have been out of the loop so long that I don't recall what a "hot" roof design is....or perhaps, I never did know. Can you describe it to me? Maybe it is still an option. At any rate, I must act fast as I have sheathing & some pricey LVL beams currently exposed to the elements. Thanks for your post. rusty Curt Norton, CSI, CCS Senior Member Username: curtn Post Number: 33 Registered: 06-2002 Posted on Thursday, December 18, 2003 - 02:34 pm:    The hot roof, just means that the attic is treated as conditioned space and not vented at all. The insulation is directly under the roof material. This way there are none of the problems with condensation (ice? depending on your location)and vents that get blocked up. Think of a cathedral ceiling, instead of insulating between the rafters, insulate on top with a rigid material. The alternative to rigid is a spray in place foam. Check out www.icynene.com Click on case studies and then on cathedral ceilings. Unfortunately, at this point, it may be to late to switch. rustyb (Unregistered Guest) Unregistered guest Posted on Thursday, December 18, 2003 - 08:47 pm:    Ahh, yes. That is the type of roof I used on my southwestern designs. The roof structure was built flat like a floor with tapered EPS applied over with ballasted EPDM on top of that. Simple, clean & effecient. Yes, at this point, it is too late for a switch. I will continue brainstorming and in the mean time, get the roofing felt up to hold me over for a while. Thanks for the link and posts though. Cheers, rusty PS I would still like some additional ideas if you or anyone may have any. John Bunzick, CCS, CCCA Senior Member Username: bunzick Post Number: 181 Registered: 03-2002 Posted on Tuesday, January 13, 2004 - 03:11 pm:    Saw an ad today for a product called Profile Vent which appears to be what you are looking for. www.profilevent.com.